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Step 4c: Connect the new wires to their respective eyelets on the
LED PCB. Tip: if you are not using two different colored wires,
it's a good idea to label the wires as positive and negative so that
they are easier to keep track of later on.
If you plan on changing your LED, now would be a good time.
LEDs are polarized, meaning they have a positive terminal (anode)
and a negative terminal (cathode). The anode end will have a
longer lead. If your PCB has a square solder pad, the anode goes
in this hole. If your LEDs leads are already clipped, you won't be
able to tell which lead is longer. In that case, the cathode side of
the LED will be flat.
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